Mounting arrangements for injectors for i.c. engine fuel injection systems

ABSTRACT

A mounting arrangement for a fuel injector on an engine intake manifold includes a sealing ring engaged against a shoulder in a bore in the manifold. An abutment plate is mounted by a bolt or bolts on the manifold and a spring is disposed between the abutment plate and a flexible ring disposed in a groove in the injector. The flexible ring is slidably received in a further bore in the manifold said further bore being co-axial with the first-mentioned bore. The novel mounting arrangement permits a good seal to be obtained between the injector and the manifold without the necessity of employing close tolerance machining.

United States Patent 1191 Pugh . [45] Dec. 31, 1974 MOUNTINGARRANGEMENTS FOR INJECTORS FOR LC. ENGINE FUEL INJECTION SYSTEMS [75]Inventor: Michael Stephen Pugh, Birmingham,

England [73] Assignee: The Lucas Electrical Company Limited, Birmingham,England 22 Filed: July 30,1973 21 Appl. No.: 383,607

7 [30] Foreign Application Priority Data July 28, I972 Great Britain36361/72 [52] user. ..277/102,123/139 AW [51] mm. Fl6j 15/06 58 1 Fieldof Search..... 123/139 AW; 277/102, 105,

[56] References Cited UNITED STATES PATENTS 2,893,365 7/1959 Haefner123/139 AW 3,776,209 l2/l973 Wertheimer l23/l39 AW PrimaryExaminer-Harry N. Haroian Assistant ExaminerRobert I. Smith Attorney,Agent, or Firm-Holman & Stern 5 7 1 ABSTRACT A mounting arrangement fora fuel injector on an engine intake manifold includes a sealing ringengaged against a shoulder in a bore in the manifold, An abutment plateis mounted by a bolt or bolts on the manifold and a spring is disposedbetween the abutment plate and a flexible ring disposed in a groove inthe injector. The flexible ring is slidably received in a further borein the manifold said further bore being coaxial with the first-mentionedbore.

The novel mounting arrangement permits a good seal to be obtainedbetween the injector and the manifold without the necessity of employingclose tolerance machining.

5 Claims, 1 Drawing Figure MOUNTING ARRANGEMENTS FOR INJECTORS FOR LC.ENGINE FUEL INJECTION SYSTEMS This invention relates to the mounting ofinjectors for internal combustion engine fuel injection systems.

Conventionally, injectors are mounted with the outlet end of eachinjector inserted into a bore in an air intake manifold of the engineand a simple clamp on the manifold engages a flange or shoulder on theinjector to hold the injector body against a seal ring fitted in thisbore. It will be appreciated, however, that the effectiveness of such amounting arrangement depends to a large extent on the machining accuracyof the bore, the clamp seat and the injector body. If the tolerance istoo wide, then either the seal can be damaged by overtightening of theclamp or a good seal may not be achieved. Thus, expensive closetolerance machining is necessary.

It is an object of the invention to provide a mounting arrangement whichavoids the above-mentioned disadvantage.

In accordance with the invention, a mounting arrangement for an injectoron an engine intake manifold comprises a sealing ring in a bore in themanifold, an abutment mounted on the manifold and a spring actingbetween said abutment and the injector so as to urge the injector intosealing engagement with said sealing ring.

An example of the invention is shown in the accompanying drawing whichshows an injector mounted on an engine air intake manifold, the manifoldonly being partly shown and being in section.

The manifoldl has a stepped bore 11 into which the outlet end of theinjector 12 is inserted. This bore opens into an air inlet passage 13. Asealing ring 14 is positioned in the bore 11 and engages an internalannular shoulder 15 therein, The injector 12 has a nozzle 16 whichprotrudes through the sealing ring 14 and a cylindrical portion 17 whichfits within the ring 14. A

shoulder 18 is formed at the end of this portion 17 remote from nozzle16 and engages the axial end of the ring 14 opposite that engaging theshoulder 15.

The manifold 10 is formed with a flange 19 which has a bore 20 co-axialwith the bore 1.1 in the manifold. A rubber or other flexible ring 21 ina groove 21a on the body of the injector is a sliding fit in this bore20. An abutment in the form of a dished annular plate 22 with one ormore lugs 23 offset from the plane of the plate 22 is mounted on theflange 19. A helical compression spring 24 surrounding the injector bodyis compressed between the plate 22 and an annular, steel support 25abutting the ring 21 so as to urge the injector body towards the bore15.

The spring 24 is so chosen that it exerts a sufficient force on theinjector body to ensure that the shoulder 18 remains in good sealingcontact with the seal ring 14 at all times during vibration of themanifold. During such vibration, the ring 21 serves as a shock absorberto protect the injector from damage.

I claim:

1. A mounting arrangement for an injector on an engine intake manifold,said mounting arrangement comprising a sealing ring in a bore in saidmanifold, an abutment mounted on said manifold and a spring actingbetween said abutment and said injector through the intermediary of aflexible means so as to urge said injector into sealing engagement withsaid sealing ring.

2. The arrangement according to claim 1, wherein said flexible means isa flexible ring.

3. The arrangement according to claim 2, wherein said flexible ring iscarried in a groove in said injector.

secured to said manifold.

1. A mounting arrangement for an injector on an engine intake manifold,said mounting arrangement comprising a sealing ring in a bore in saidmanifold, an abutment mounted on said manifold and a spring actingbetween said abutment and said injector through the intermediary of aflexible means so as to urge said injector into sealing engagement withsaid sealing ring.
 2. The arrangement according to claim 1, wherein saidflexible means is a flexible ring.
 3. The arrangement according to claim2, wherein said flexible ring is carried in a groove in said injector.4. The arrangement according to claim 3, wherein said flexible ring isslidably received in a further bore in said manifold, said further borebeing co-axial with the first-mentioned bore.
 5. The arrangementaccording to claim 1, wherein said abutment is formed as a plate whichis detachably secured to said manifold.